561677840 has 40 divisors (see below), whose sum is σ = 1348032768. Its totient is φ = 217422720.

The previous prime is 561677839. The next prime is 561677881. The reversal of 561677840 is 48776165.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 561677791 and 561677800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110762 + ... + 115721.

Almost surely, 2^561677840 is an apocalyptic number.

It is an amenable number.

561677840 is an abundant number, since it is smaller than the sum of its proper divisors (786354928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561677840 is a wasteful number, since it uses less digits than its factorization.

561677840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226527 (or 226521 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 561677840 is about 23699.7434585271. The cubic root of 561677840 is about 825.0794364894.

The spelling of 561677840 in words is "five hundred sixty-one million, six hundred seventy-seven thousand, eight hundred forty".